A behavior modification approach to education that involved short lectures and self-pacing was developed by who and what was it called?

The vietnam war was considered by many to be america’s first unopposed win independent war defeat

An externality can be created by a. people working at a production job and enjoying their work b. a production activity but not a consumption activity c. a consumption activity but not a production activity d. a production activity or a consumption activity externalities a. are always positive, and an example is flu vaccinations b. are always negative, and an example is the pollution created by trucks c. can be negative or positive. logging has a negative externality, and education has a positive externality d. can be negative or positive. a negative externality is having to go to school when you would rather go to the beach, and a positive externality is spending time with your friends

Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?